I am having a problem with a jasper transmission we just installed. It is in a 2004 Ford F550. We installed the trans w/ torque converter and a new trans cooler. After about 500 miles our customer brought it back because of harsh engagement. I called Jasper and their tech told me about a relearn procedure that needed to be done. I completed the relearn procedure, ( tech bulletin #5R110W ) and now it has made this truck worse.. not even drive-able. Now when I shift it into gear with my foot on the brake, after about 5 seconds it will try to move the truck almost stall the motor (has killed the engine twice, now I take out of gear right away). I don't know what to do, Jasper not returning my calls now...
Country: United StatesMake: TransmissionsModel: ford f 550Year: 2004Engine: 6.0L powerstroke
Hello, I'm Chris.
Do you want me to help you figure out whats wrong?
Are any codes storing?
You are aware that if you repair this unit, your going to void the Jasper warranty?
Will it try to stall the engine when any gear other than P or N is selected?
Hi, I would appreciate any help you can give. My scan tool will not hook up to the trans, only the engine, but there are no warning lights on on the dash. I am trying to figure out if this is a truck problem or a transmission problem. It ran and shifted great when they picked the truck up. A week later they brought it back because it had harsh gear engagement (especially noticeable from park to reverse) and it was also not shifting right in Drive either. It seemed like it would start out in 2nd and the downshift once you were going about 5-10 mph. Customer also the tow/haul light would flash on the dash, I have not seen this though. Jasper told me to do the "relearn procedure" where you shift through the gears in a series. I did that and that is when the truck became undrivable and would stall the motor, and it would stall in whichever gear I shifted to first D or R. After that I disconnected the batteries for 12 hours, the with the batteries disconnected, touched the + and - cables together to hopefully clear any PCM memory. Now, we are back to were I started from, just harsh engagement. The stalling problem hasn't happened again since I cleared the memory. Jasper did call me back and told me try and figure out if it was the truck or trans.
Thanks so much for all the useful information you have posted to help me help you
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You are going to need to try and get some codes. This will mean driving it for a while as best you can then you have to use a scan tool that has the ability to get engine and trans codes. There are a few things which can happen on the engine side that can effect the transmission. The most common is a resistance issue in the engine cooling fan that is on the same circuit as the transmission. You can unplug the fan for a short test drive to see if there is any difference in the transmission activity. If there is no change then its time to remove the pan and solenoid body. Once the solenoid body is out, you need to remove all the solenoids and check for any signs of metal shavings, then split the solenoid body open and check the plastic internal filter for signs of metal shavings.
If any metal is found then you must rebuilt the transmission with a new converter and replace all the solenoids and flush the coolers. If there is no metal then you should of gotten some codes indicating solenoids that are faulty. If the fluid is dark and has a burnt odor then you have some burnt up clutches.
Also check your wire harness to verify the wires and pins are seated firm and the wire harness is not crushed anywhere.
16 yrs. experience with auto, manual, & CVT drivelines